Production Switchers

I understand that running an Acuity in UHD mode halves the resources (i.e. 2 HD MEs are required to create a single UHD ME, 8 keyers become 4, etc.)

If we have a 3-ME Acuity and want to run in UHD mode with 1 ME, can I use the 3rd ME in HD, or does it become disabled?

How are aux outputs affected by running in UHD mode? If we have confidence feeds from the switcher that don't need to be in UHD, is this even possible while in UHD mode?

Finally, if we have an older multi-input card that does not have 12G inputs, can we still combine 4 3G inputs to feed a UHD source?

Thanks.

The ME will not be available in UHD. You could add the 4th ME to get 2 UHD MEs. 

the outputs can output in Quad 2SI so you could connect a single link to a 3 G monitor. 

on the 12G output cards you can run single link and 1 of the extra non 12G in the group will also output 1 of the 3G links in addition to the UHD 12G link. 

the HD only input card would be able to allow you to bring in the inputs as long as they are Quad 2SI UHD. 

I understand that running an Acuity in UHD mode halves the resources (i.e. 2 HD MEs are required to create a single UHD ME, 8 keyers become 4, etc.)

If we have a 3-ME Acuity and want to run in UHD mode with 1 ME, can I use the 3rd ME in HD, or does it become disabled?

How are aux outputs affected by running in UHD mode? If we have confidence feeds from the switcher that don't need to be in UHD, is this even possible while in UHD mode?

Finally, if we have an older multi-input card that does not have 12G inputs, can we still combine 4 3G inputs to feed a UHD source?

Thanks.